Week Two

Question 1

Cell cycle

Answer 1

G1=cell contents except from chromosomes are replicated
S=each of the 46 chromosomes is duplicated by the cell
G2= the cell double-checks the duplicated chromosome for errors making any needed repairs
mitosis=chromosomes are separated in two chromosomes
Cytokinesis=chromosomes are separated into two cells

Question 2

Leptotene

Answer 2

chromosomes start to condense

Question 3

Zygotene

Answer 3

homologous chromosomes become closely associated (synapsis) to form pairs of chromosomes (bivalents) consisting of four chromatids

Question 4

Pachytene

Answer 4

crossing over between pairs of homologous chromosomes to form chiasmata (sing. chiasma).

Question 5

Diplotene

Answer 5

homologous chromosomes start to separate but remain attached by chiasmata.

Question 6

Diakinesis

Answer 6

homologous chromosomes continue to separate, and chiasmata move to the ends of the chromosomes.